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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d526332a00d36f992e350ee544d42df4af0f3d811658191b64ffec946b96465' 
  AND token = 'z5HKNYsGY9vuZ9P3pfX+33cibfKblbdA7xpmrkw6hUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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