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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4c285fa0cb3d8457c729d20d69d8131ae0c3ce2810d2812792cf9cb28f971e' 
  AND token = 'Fsepf9TZJBfJq7vzL9frTeZSJlbWt1VZkeSdbgDJfIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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