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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2588787a5de2ed5af2492871a56f7b0a623ebbffec4c54d81a4fd896981e7a87' 
  AND token = '5+zzy+mBOh7/GeWxiptZ+mfIFZyh8g6hj+W76HQdz5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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