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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a17bb4e94350583b1c38d641a9791b9be0f1929daf1fc22b9d9ce4452e8430f' 
  AND token = '5KnU90r1mqBTNth4CbIcPacmMyXkEYwNov9+Uso7Krs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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