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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9213d666a81086701152745901b0437a7ec33f9387dc3361a842878ca0336793' 
  AND token = 'KjegEusTFZe1YeHQxVYG9uDsXh3EZOhrdRKgj1iponQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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