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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335b74031f168fecdbe48259d2613dbeece65a2ef2afa593278fb7a922ab36e2' 
  AND token = 'lhe/0jlT7U6J3T1Nlxj9x9ugdSAjLjkyzb9UL18nuhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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