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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d9a39894735a8355402696b23138c2423931dc037d7abe26429f5283b508b5' 
  AND token = 'pGiuVgXs4nUdsPqPUZMMihrz782XSX4ilR4LPVzG0O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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