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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240aa67deb7591fc7db2568a298301c3097a7167fe88cd5af9d5ccf6e5fd00fe' 
  AND token = 'x7hKchtj9jD2pqsPxMCCdeE5ubZkI2j8otUpZoQKb/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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