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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e286f0aa353683535a0fb87d69b6a1cdcd6c582c9aa50503d30993eae34152' 
  AND token = 'xBm86E4XQGqvbxXvRAmIn3bgpw0lXLTGG1sLbYGcLrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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