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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aee0865ecc3c3746567e2026bb8b5b51c76db779ac84afa709de9246be47730' 
  AND token = 'HGLWpwzpHSxmk+b8yxYU/Q44lsCpiAdCP7nHevHiUj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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