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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fe74bc28e10a909037993d03408a9ea2f0084c3090f9a6eee64aaae827cdc9' 
  AND token = 'SI0PNT/ZzH+GzpnrMzjKhxRwVVRks3t1lUhAngU04eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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