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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330ca2884c8aa9c58fceef5e96739c0eef809c6202626920fabfd813682d4555' 
  AND token = 'spscYZamotSBw0YRN5trBys/xVZuWhlJ8Bn3EKOg0LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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