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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c65b18c37c86a08765d9478bb5ee0d5744e77aa88bf2ff1881edfedd07f8c70' 
  AND token = '4ZhGFG/6StgwGyfGK/nhICyNh9OJHTIyCdjlT5f6z/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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