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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffab86bb73f3f7ad62939f80281f4b7d87484671c557dfedfef6900ea1593715' 
  AND token = '9BfT3XV0PNzSRiYIWRDN1hvW88zViJ58DUMP5wO5IHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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