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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6e1081d9b48062f4952ee2c4e10b9646417e3c752e834f90ff3f449fb92287' 
  AND token = 'nU9ahqMBKeweUqIbpcfvY0plukAv0qSFoD8oVCzTRF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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