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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2959b762963acc2d2b7cae813f755fafb6d821ff013e348b4d7452a98ffbf102' 
  AND token = '4t+O+U0JxUAziXxyHwjHkyp96uJToW21hHFtyROE1ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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