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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158ba91d8dba4450cef7c05f21ccb3ac8f42b7410cacf5f0c69e6ceac818ed3d' 
  AND token = '18+z4KkG4mQTA97m5WlhlJ9viroXhkNMw/jLpe6fXxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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