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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d560af608607e09ee9d49af2daa8b7e1593b9351fce68758809bc2cf48b3464' 
  AND token = 'jjxwgcVX34+x4G9xSNSObzs5srj4BCQyaBWX/sN7VYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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