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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5ce3c100ce29d0cc605d128ba862d75c23531bb10bd8678bb03e763f014f17' 
  AND token = '9584iYKgieEle+3ficROVmKGJ0BFdQ9Ox6Y5dLIyH5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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