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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c232b0235896764e9ef5868227eb8ba6002c5cc3f5ec946f631bd8e013180214' 
  AND token = 'hzVsinbr5DnzFbuX2jI5HbpR1OKa2g3uD/lZcretN9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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