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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e412415ccada579873a0bb4334ec7a5c85b51c9c64d9298afde4440121bc11b6' 
  AND token = 'Hu6xQREEj65bEkGgQmJVx41Able6yOr7nxc93HeNQsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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