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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f68cc0b6f1c366ec4f90258fb5d0dc6c9f449a7bf9615a82316fcebb0c90df' 
  AND token = 'vIThTeJCTiFFgdUDTERq+o0QhYS06FuOgTVu50SUfXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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