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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11085c4c3a9cbff74392263c9ef4802eded2975a1ebd1e7f0292d999eacf838' 
  AND token = 'EfSMDP9FfcF8zYYeGQrEoEdUX7VisUvjka7utBim0N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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