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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b31d1e68807eb2afe3912a00923e5c3ca3a18d103a4aa702683ad8fc199eca8' 
  AND token = 'UWgalee09pA3XHTjNCsQ6V0TrWbhn7fD7b31ZUZgQAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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