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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202b64a31196659908498327abf4922c4949de0bb35c128ebd71d65241d1d13c' 
  AND token = 'u2AmxSDMbNTw/recmHsLXgRAk66gd6badGtwyjZaFgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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