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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944585a01e2749d6f166212902710c3d961226ccc1e246b01833d3f8445b1ff3' 
  AND token = '4oSeEts5JIqwdjiU8KMaAXolEr9x9neOc0WTwRioN9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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