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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89749cf0bdd67edd04a3c6fd6e85d3f6cee1c89965fe0c40809e825c68ab234' 
  AND token = 'fJ+vX5uWeUJsbJ5lKCC6phl/HDCUHVnhJPAa05n1gXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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