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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b09a982dc7bd26cdd3e61720fa8c91fd967ceda15a3c5f26a69a5a8572960e7' 
  AND token = '4smrm7omlcZHZ4oqyEPSIfRXzJqGpIrrh2ZYmeR7x5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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