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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfe0c116b86620e0f15adaa91eb989083bd8c1fdf31bc76893bf32dcc50a3d7' 
  AND token = 'Lui/9EZ0b13D+y3LgiYoIQZD6mpGGXobX/bbXbWVhHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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