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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43cb2433b4971688dfd82b9c48e124792a5ddfed4b08adb1cd605244b59130e0' 
  AND token = 'i/p5c1EjMa4ezdZiZd20ozCqAva0Pujk8MA7yJTqDOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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