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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0988faf2fe73762a76e5c8e9d0f74851f03b06cece083fcf116170fbc777dfb9' 
  AND token = 'frsrCZwUZzsRcke54a5d/vvkdztWmwhe+BIiy25tYW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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