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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cb60489643668a957eb0b9342724862b0f33e146ae60cbebb4bb327546bdab' 
  AND token = 'EndJt4krNBh/9qgHXENgIxJSyhNNhSgyoZTG638wCJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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