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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8bb7b1fcebc92e96b36fb2a113870ae61d2e25aeff1996ea9dfd0f34ec9644' 
  AND token = 'zdbFtiS/9cR8wDetVjt+S2eBWa05171upem9yrxkomY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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