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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7fee2e5a06bfab2f4160034aa896c65bd7fa71139860e6a579f6bdac6cc5cc' 
  AND token = '2wYVw8PCSKi321fmop6ON6+sm1B/SXmvwBq5q5aHEU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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