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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e88236ee962310ecd51327c96d15a158a309b0a59e4b0586e04f1d622ed5b02' 
  AND token = 'n5q/C722MoljPcLz2uLBR9ZXqg2IJPpUjkwVn0FnXUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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