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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79b07cde953f2e8a73d6a2c2f36b0b29254ed612040352387134bae0379c544' 
  AND token = 'a8wtbgEk4P19F5nZVVZ90Y8JAZebgNO6IcVMv5nR/W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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