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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aef3f550923ae04373df3fe610f66a80078b2fcee2e00bb0f43d7359773ab04' 
  AND token = 'YaYwC1NB06OjUuyRVoa8A68dZ92d8QwzpE9jHL/zJSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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