SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509f16a518462846b420a1cff7d0cbeeb12022947cc4dc29dd9a762aa4d0d2b8' 
  AND token = '23/T+oJB3BS/AwznGAlMpjRZIXe/PmDlUMwssXPWpAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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