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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea4d400ff8d62e2b625023ff780b3733ed6ed8d50620f077df1e2c97dbc9a81' 
  AND token = 'RqUkdA6r60luqV47Dtakppf9BFfUx7nQjaIJPE9LhA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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