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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44630722db61b04b1344a66341b4d1f58ebf9bbe3289075cd7aa3ade7317146' 
  AND token = 'kl6pop2IGw5a0BZRhmBMT1enrrWcfphp6aA6/tYkNo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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