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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d2fdca240459f8b1278221fc2c2bd10507de7142b2bd8f9938115fc706225e' 
  AND token = 'hxnC7mnkXIGUAW9+Ip1JV7bLovrjS01KCPaRxcWE74Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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