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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6330b763f56d66a14faab683e416da95bc6e383dff8ea8cfeb7c45d101fc11f' 
  AND token = 'e7FbEL43ud5kA7ukqjjgJrEhjcNa5gUa31vGJ0kKWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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