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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce869b170c2fd9bdc0484462c1c936853f867a08f253ae26bbe0e3eebd32af52' 
  AND token = 'EW2q/kNiLU1KhjH7KjAKK1HXI1BVGcWOfPUYYjS6S8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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