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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e5c01ea9cc17ef71dfda2ee27af908e2bdb3cf0d5c73c121e800e77f91c152' 
  AND token = 'bNxwQUO9ijwo6DZyClJGo2z+xHM+woXcgPJIaCshHUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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