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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853c89126d7f1e2258f9892d2b1fd056ea2f3295b1a1c3d8cc3cfd6c71bea7f6' 
  AND token = 'pqTspQaLsTh9FAHBcPplkOIXEq/A7w6bX+H2PUw4jaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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