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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062c23cf842e1373536d5218ec12249166ebf980879207a6ba8ed0d1d0311b32' 
  AND token = 'IPurNF1E39gqtklpQ6jmSvlaE0Fwi+kxeOE1aau/wDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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