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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c07544638e5552d4d7b2724667914a18c194e4e34bec6976736072f300e16d' 
  AND token = 'AcvC4c0T4UW3jn88QZZTZAbOaSf8bTK8mU+JGvVBjwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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