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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2def25397c47f128160576e0c5c09df5bdcf8fa68fa2e58fcf7c6cbb4dd316' 
  AND token = '0d7FGQmqWB6AqajxgvRq7Rix+GbW6m5SX8gu/SUnJyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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