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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e6fd3f4d65ececaf4abf3fde08a1f44828acc07e08df7fe45dc244b76e08ef' 
  AND token = 'cuEh60AchLcluzL4tap57Vrq2C/Q1FhO+V5YzRw8Tro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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