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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0d3f3efcc6a7b3c909e58fc7d8ae7a5dbb255e0ff0d58bdb3a3316add457e7' 
  AND token = '4tqVfIdVLt2M++4SKwy5qovFQVqvVCsishVguxVbzBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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