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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee67b0ed90845f2c52f958553b3d79fb5ccf04d407b4e43c407604479ce0293c' 
  AND token = '3cBtBpMk1k+0NUsYNFuqG8GNU/buLBbmLKDPD/atzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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