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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f385e846334fb156a59889aef7a09eea608eb040b58060f6591e1df6c95c9e' 
  AND token = 'v4p1gTf8FaYUn6TCYHLqkIi2hqOjTRnBqOwIl92WHv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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