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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5056e9bcef464cd77949b521d495bb474f016f8c4af43e96823152255646351' 
  AND token = '+G3/hoxoLEg6JFPeNx77k5TKeGN3G988JDXhyXbAqa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}