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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee9e2bb9ae1a35a74106152a88c741d78bec71e558670e7eb8bfb85d6cc2c5a' 
  AND token = 'btW0nqDK3z1y72T2ooKlljO8y7+bx8RzoeVn0ZgSjak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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