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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fa74ca1fb300fa5aca9b43ed3a15e9c8e7c1b78e7bbeed19888198bee5e5ed' 
  AND token = 'mPkJIMAG2T/maHWn17yt5tDsjgD9XSS5YPJLBy9mV7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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