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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbcdd2735a399af283c8ae28bb9bc6737f0711b08e46ed8d64ff756a5282882' 
  AND token = 'EubI+JaIEFY94l9SiIpir8cfbAk89vIqnhZNYsMDuTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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