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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a666e08cb9fce2be0ef415589b18d09afbab97b8684f73c1f80fde86ebda8178' 
  AND token = '4047wPq4eYU5t3jdkgcMkMgTJj5e2EmevnF4zNwENwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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