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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2528545a612fd755023f8d5c69b3e93c20ceef45906ff103917f8ebcfed79ee0' 
  AND token = 'eRaWtGWBC7FZFbURb8+ZCMwGNmx4EUlLpjCc+2iyNCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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