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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fc817596bedfc3be6f55918393e7f8ff2a20bfcbbd4965669ac67d59332ff3' 
  AND token = 'eWX6u75nInPwiWO7uWQ+Whug+c6aa2GLnlQYQBz8dUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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