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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068d7758d29f93d3af097a69c55266c75fc1625dcea5734152df4f1f9f34debb' 
  AND token = 'rq4J7BmJBCde8eQ1cgwz633pRWq5HH4k0DcYSM1dF0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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