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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfc5edbbaf61d939fb788969ccda9ac1c6dc3e7d6f45981f46853a61565e51f' 
  AND token = '1wfi7kxEbgz19r4etGybn1HQZFE5B/BQ8nwtyDjmNTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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