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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da638a5e607c1f71d44067b5d31f6c304a1f015dcdec851a81ebb14afabbadbc' 
  AND token = 'jJQPGWXFZH40fugg9dOc7gE3I8NsgZi8QA5rQytZGyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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