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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e486157ea8745e5f1aca7043d7cd552f4a7d699b7b6ff65a910f62af5f5f3cf8' 
  AND token = '3gzmDmRQf1q5BCIrE00GZAPHP1ig7f2WJqX7P3XJnxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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