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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe387b341ea1d1c60b84048f490f04d4d4dbfdc3303a5efa182db904b515756f' 
  AND token = 'pKadloelKiSeODuRll9+U4wovU9H7T0qUwtD3x0AX5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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