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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d04128f047f18d1e80eee0924a2c6ad2ab4e8e2c56e298e2bd2fbbe1c8739e' 
  AND token = 'L9tt1JEZ3ofth/EZRjo2L2A976dd3UmgS5lZ8VLV/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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