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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be897938059121668042c1d3d8bb34515a564aadf4a8894ba7f6ad11f57eda6a' 
  AND token = 'y2vgvlDbxQw0WAKop9G3RyMD1oQtFh3FKDXXztrvGWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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