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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc79ec3ea848d2b280f8c579d9cb13019f76f2da83982f1df5a5e0eb113c7d4' 
  AND token = '/tuuUxorcyPnaK88AG1qrHaV4m0jQzZWda5lkanwvlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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