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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a7750be51f05114ee54266484820afcac2266b4b729cfb7cbee2f8c2075db9' 
  AND token = 'ZK2zvLZ6w8Hl5e/Wf4oMes+MRwrNlFJyLdG+GxWK/Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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